ISO1412BDW - 500kbps Isolated RS-485/RS-422 | Texas Instruments
料号： ISO1412BDW ✓ 量产中ISO1412BDW 概述
An isolated RS-485/RS-422 transceiver is a communication interface that combines differential line drivers, differential receivers, and electrical isolation within one integrated circuit. In the broader hierarchy, it belongs to interface ICs and bus transceivers. RS-485 supports multipoint, half-duplex buses in many installations, while RS-422 commonly supports point-to-point, full-duplex links. The ISO1412BDW supports both standards and provides 500-kbps operation for industrial communication, factory automation, building controls, and equipment networks.
Key features include 500-kbps signaling speed, full-duplex operation, 5-kVrms isolation, EMC protection, and operation from -40°C to +125°C. The 16-SOIC package provides a practical surface-mount option for industrial control boards. The ISO1412BDW is identified as RoHS compliant by distributor data, and its operating-temperature range supports use across demanding commercial and industrial environments. Exact supply-voltage, receiver-threshold, propagation-delay, and bus-loading limits should be confirmed in the manufacturer datasheet.
The ISO1412BDW is designed for bidirectional differential data transfer across an isolation barrier. Full-duplex capability permits separate transmit and receive paths, which is useful when a system cannot switch a shared half-duplex bus. The integrated protection and isolation functions reduce the amount of external surge and isolation circuitry required, but correct layout, decoupling, bus termination, and common-mode considerations remain essential for reliable field communication.
Typical uses include industrial PLC and factory-automation links, isolated instrumentation, building-automation equipment, long-reach RS-485 or RS-422 nodes, and industrial gateways that must bridge a noisy bus to a host controller. The 500-kbps rate is suitable for supervisory data, configuration traffic, and moderate-speed industrial messages rather than high-bandwidth streaming.
Design the isolation barrier and bus interface on the PCB with the manufacturer's isolation and layout guidance. Keep bus-side and logic-side copper, components, and ground systems separated, place decoupling capacitors at the appropriate supply pins, and apply termination only where signal-integrity analysis requires it. The isolation rating and EMC claims must be evaluated for the final enclosure, cable, grounding, and surge environment.
This page consolidates the verified manufacturer and distributor information for the ISO1412BDW, distinguishes confirmed characteristics from parameters requiring datasheet review, and provides application and selection guidance that is not available from a distributor listing alone.
直接替换替代料： ISO1412BDW ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料ISO1412BDW 规格参数
| Product Type | Isolated RS-485/RS-422 transceiver |
| 数据速率 | 500 kbps |
| Isolation Voltage | 5 kVrms |
| Operating Mode | Full duplex |
| Supported Standards | RS-485 and RS-422 |
| EMC Protection | Protected |
| Isolation Architecture | Single-side powered isolation |
| 工作温度范围 | -40°C to +125°C |
| 封装 | 16-pin SOIC (DW) |
| Package Form | SOIC-16, 300 mil |
| 安装类型 | Surface mount |
| RoHS 状态 | Compliant |
| Number of Transceivers | 1 |
ISO1412BDW soic-16, 300 mil 引脚配置指南
ISO1412BDW（soic-16, 300 mil 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： ISO1412BDW.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ISO1412BDW 适用于 6 应用s: Industrial PLC Communication, Factory Automation Sensor Networks, Building Automation Gateways, Isolated Industrial Instrumentation, Long-Reach RS-422 Data Links, Process and Utility Monitoring.
Industrial PLC Communication
The ISO1412BDW fits isolated PLC-to-equipment communication where a 500-kbps differential link must cross a ground-potential boundary. Its full-duplex operation can support simultaneous command and status traffic when separate RS-485 paths are available, while 5-kVrms isolation helps separate the bus side from sensitive logic. EMC protection is valuable in industrial cabinets containing relays, motors, and switching supplies. The final design must preserve the package pin assignments, use the manufacturer-recommended isolation layout, and verify supply and common-mode limits against the selected PLC interface.
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Factory Automation Sensor Networks
The ISO1412BDW is suitable for factory sensor nodes that communicate over RS-485 or RS-422 at rates up to 500 kbps. Industrial environments often combine long cables with switching equipment and uncertain grounding, making the device's 5-kVrms isolation and EMC protection more important than minimizing every external component. Full-duplex mode can also simplify fixed master-to-slave links that cannot share a half-duplex bus. Engineers should still validate cable length, node count, bus loading, termination, and fault-recovery behavior in the deployed environment.
推荐
Building Automation Gateways
The ISO1412BDW can connect a building-automation controller to a remote HVAC, lighting, or access-control subsystem through an isolated RS-485 or RS-422 link. Its 500-kbps rate is sufficient for configuration, status, and supervisory control traffic, while the isolation barrier helps protect the gateway from field-side transients. EMC protection supports operation in equipment rooms containing variable-speed drives and switching power supplies. The board design should use isolated bus-side and logic-side ground domains, short isolation paths, and validated surge protection appropriate to the installation.
推荐
Isolated Industrial Instrumentation
The ISO1412BDW is appropriate for measurement and instrumentation equipment that must transmit differential data without sharing a ground reference with field wiring. The combination of full-duplex operation, 500-kbps throughput, and 5-kVrms isolation supports monitoring and control traffic between a host and remote instrumentation. EMC protection helps reduce sensitivity to industrial interference, while the 16-SOIC package supports compact controller boards. Designers should verify input thresholds, common-mode limits, propagation delay, and the precise logic-side interface from the manufacturer datasheet.
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Long-Reach RS-422 Data Links
The ISO1412BDW supports point-to-point or multi-drop RS-422 communication at rates up to 500 kbps when the bus topology and loading satisfy the device limits. Full-duplex operation allows transmit and receive pairs to operate concurrently, avoiding software-controlled direction changes. The 5-kVrms isolated interface is useful when the remote equipment has a substantially different ground potential. In practice, engineers should calculate cable loss, common-mode range, and termination requirements and should review the exact datasheet limits before treating 500 kbps as usable over every cable length.
推荐
Process and Utility Monitoring
The ISO1412BDW can connect pumps, meters, remote sensors, and utility equipment to a supervisory controller through an isolated RS-485 or RS-422 network. Its 500-kbps rate provides sufficient bandwidth for routine telemetry and control commands, while the isolation and EMC protection improve robustness in electrically noisy installations. The 16-SOIC package simplifies assembly in compact industrial equipment. Deployment decisions should include operating-temperature verification, grounding strategy, cable surge exposure, bus termination, and recovery after transient events, all using values established in the official datasheet.
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推荐产品汇总
工程参考数据： ISO1412BDW ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 |
|---|---|
| Brand | Texas Instruments |
| Package | 16-SOIC (DW) |
| Data Rate | 500 kbps |
| Isolation Voltage | 5 kVrms |
| Operating Mode | Full duplex |
| Supported Standards | RS-485 and RS-422 |
| EMC Protection | Protected |
| Operating Temperature Range | -40°C to +125°C |
| RoHS Status | Compliant |
| Transceiver Count | 1 |
关键差异点
- Full-duplex isolated RS-485 and RS-422 operation （对比 No verified drop-in alternative was supplied)
- 5-kVrms reinforced isolation （对比 No verified drop-in alternative was supplied)
- EMC-protected interface （对比 No verified drop-in alternative was supplied)
- Wide industrial temperature operation （对比 No verified drop-in alternative was supplied)
设计说明
Follow the Texas Instruments isolation-layout guidance without reducing the recommended creepage, clearance, or isolation copper spacing. Keep the bus-side and logic-side ground networks distinct, avoid routing unrelated high-energy conductors beneath the isolation barrier, and place the isolation capacitor and required supply-decoupling components close to their associated pins. The supplied search data confirms 5-kVrms isolation but does not provide the layout artwork or spacing values, so those dimensions must be taken directly from the manufacturer datasheet.
Treat the ISO1412BDW differential link as a controlled-impedance communication interface. Use twisted-pair cabling, route the bus as a defined pair, minimize stubs, and apply termination only after evaluating the complete topology. The device supports up to 500 kbps, but usable distance depends on cable loss, node loading, propagation delay, and common-mode limits that are not quantified in the supplied snippets. Verify these parameters before fixing the operating baud rate or cable length.
Do not substitute a generic RS-485 transceiver merely because it uses a 16-pin SOIC package. A valid replacement must preserve pin-to-pin assignments, isolation topology, logic levels, bus thresholds, propagation delay, supply requirements, and the 500-kbps, 5-kVrms operating targets. Also verify whether the design requires full-duplex operation or can use a lower-cost half-duplex interface; using the wrong directional-control arrangement can prevent bus communication.
Place bus-side protection and filtering close to the connector and transceiver pins, and maintain the separation between external cable paths and sensitive logic. EMC protection is a stated feature of the ISO1412BDW, but it does not eliminate enclosure, cable, grounding, or installation deficiencies. Evaluate conducted and radiated emissions with the completed board, power supply, cable, and load because a verified IC-level EMC capability cannot guarantee system compliance by itself.
合规信息
RoHS compliance is explicitly identified in the supplied distributor result. REACH, lead-free status, halogen-free status, conflict-minerals status, and automotive qualification were not provided and remain unknown or not applicable.